For this Extension to work, you need to enable the following:
You’ll have to go to top bar > Menu > Extensions > and then scroll down and tick the box “Allow access to search page results” for Buster

after that install the app in here / extension options press download app and after that open setup u will see an website pop up put the directory where u want to install it in and after that done the "allow access to search page results" is critical and. if u want / have an issue open an issue in the creator's github https://github.com/dessant/buster